Four-phase and double-salient brushless direct current motor with symmetrical phase inductances

Abstract

The invention discloses a four-phase and double-salient brushless direct current motor with symmetrical phase inductances. According to the four-phase and double-salient brushless direct current motor, a unit motor is of a novel 12 / 9 salient structure or a novel 12 / 15 salient structure, each excitation element is wound after spanning three stator poles, each stator coil of each phase stator winding is distributed at different positions, and the symmetry of the phase inductances is achieved by a mode of symmetrically distributing the four phase stator windings; the pole-arc coefficient matching size of motor stators and rotors is determined by theoretical analysis and emulation verification methods, so that the phase inductances of the motor are hoisted and decreased by an electrical angle of 180 degrees, the total permeance of exciting windings remain basically unchanged, the positioning torque of the motor is small, and the four phases are electrified at the same time to operate. In addition, the four phase stator windings are independent in pairs, so that the motor can operate by only using the two phases after one phase is in fault, and the fault tolerance performance is favorable. Moreover, the total permeance of the exciting windings is unchangeable, so that the four-phase and double-salient brushless direct current motor has the advantages of small positioning torque and the like.

Description

technical field [0001] The invention relates to a four-phase double-salient pole brushless DC motor with symmetrical inductance of each phase, belonging to the field of special motor body design. Background technique [0002] Double salient pole motor is a new type of motor composed of position sensor, power electronic power converter, permanent magnet or electromagnetic excitation unit, controller and motor body with salient pole stator and rotor structure. As a new type of variable reluctance motor, it has a large ratio between the maximum value and the minimum value of reluctance, and has good electromechanical energy conversion characteristics and application prospects. [0003] The traditional double salient pole motor is a three-phase motor, which adopts the 6N / 4N pole structure of the inner rotor, the number of stator poles is 6N, the number of rotor poles is 4N, and N is a natural number, indicating the number of unit motors. In order to further improve the reliabil...

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Problems solved by technology

[0006] The present invention provides a four-phase double-salient pole brushless DC motor with symmetrical inductance of each phase in order to solve the problems of positioning torque and inductance asymmetry of each phase in the traditional four-phase double-salient pole motor, and its unit motor is a new type 12 / 9 or 12 / 15 salient pole structure, each excitation element is wound across three stator poles, and the distribution position of each stator coil of each phase stator winding is different. This symmetrical distribution method of the four-phase stator winding achieves the The symmetry of the inductance; use the method of theoretical analysis and simulation verification to determine the matching size of the pole arc coefficient of the motor stator and rotor, so that the electrical angle of the rise and fall of the inductance of each phase of the motor is 180°, the total permeability of the excitation winding remains basically unchanged, and the motor positioning The torque is small, and the four phases can be energized at the same time

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